When did this 'officially' change? "SQL-MM defines the default SRID of all geometry constructors as 0. PostGIS uses a default SRID of -1."

[Michael Downey via postgis-users]

Hello,

I see this note
"SQL-MM defines the default SRID of all geometry constructors as 0. PostGIS 
uses a default SRID of -1" on the PostGIS_Special_Functions_Index.html page all 
the way though 3.2
https://postgis.net/docs/manual-3.2/PostGIS_Special_Functions_Index.html

Since then it is not there.

I have not checked this question under versions < 3.4. AI results indicate that 
it was 3.0 when it started. A question from a user in our community indicates 
2.0.

Perhaps it started at an earlier time and culminated at 3.3?

Thanks,
Michael